With Mass Effect Legendary Edition, the multiplayer requirement has finally been lifted, so you just need to collect as many war assets as you can. In the original non-legendary edition version of ME3, the default TMS is always 50%, so the only way to get TMS to 100% is to play multiplayer.
The TMS level should be 100% for the best ending. Of course, unless you do soĪs GamesRadar states, another thing that is closely tied to war assets is total military power (TMS). It’s also the main reason why playing all three games is highly recommended, as starting directly with ME3 doesn’t give you enough assets to get a good outcome. This includes military, weapons, technology and allies. War assets can be collected or recruited throughout the main campaign, including those earned by playing the first two games of the trilogy.
